It's been a rough couple of weeks for women in STEM. Most shockingly, Adria Richards, former developer evangelist at SendGrid, was fired after she publicly reported two men (one of whom was also fired) for making lewd jokes in earshot at a PyCon Conference.
If enough people cry wolf too many times, we'll be too tired for the real fight, for things like nurseries in the workplace, flextime, maternity leave, etc. More of us are on your side than you realize. Even if we tell lousy jokes.
Threats like this are not harmless expressions of free speech. They're akin to hate speech and are maliciously intended to intimidate and silence. Messages like this don't make women feel safe. And that's the point, isn't it -- to make sure our gendered safety gap stays constant.